public class nvur {
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>留言板</title>
  <style>
    .container {
        width: 350px;
        height: 300px;
        margin: 0 auto;
        /* border: 1px black solid; */
        text-align: center;
    }

    .grey {
        color: grey;
    }

    .container .row {
        width: 350px;
        height: 40px;

        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .container .row input {
        width: 260px;
        height: 30px;
    }

    #submit {
        width: 350px;
        height: 40px;
        background-color: orange;
        color: white;
        border: none;
        margin: 10px;
        border-radius: 5px;
        font-size: 20px;
    }
  </style>
</head>

<body>
<div class="container">
  <h1>留言板</h1>
  <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
  <div class="row">
    <span>谁:</span> <input type="text" name="" id="from">
  </div>
  <div class="row">
    <span>对谁:</span> <input type="text" name="" id="to">
  </div>
  <div class="row">
    <span>说什么:</span> <input type="text" name="" id="say">
  </div>
  <input type="button" value="提交" id="submit" onclick="submit()">
  <!-- <div>A 对 B 说: hello</div> -->
</div>

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
            <script>
            $.ajax({
        url: "/message/getList",
                type: "get",
                success: function (messageInfos) {
            var finalHtml = "";
            for (var message of messageInfos) {
                finalHtml += '<div>' + message.from + ' 对 ' + message.to + ' 说: ' + message.message + '</div>';
            }
            $(".container").append(finalHtml);

        }
    });
    function submit() {
        console.log("发布留言");
        //1. 获取留言的内容
        var from = $('#from').val();
        var to = $('#to').val();
        var say = $('#say').val();
        if (from == '' || to == '' || say == '') {
            return;
        }

        //发送ajax请求
        $.ajax({
                url: "/message/publish",
                type: "post",
                data: {
            from: $('#from').val(),
                    to: $('#to').val(),
                    message: $('#say').val()
        },
        success: function (result) {
            if (result) {
                //2. 构造节点
                var divE = "<div>" + from + "对" + to + "说:" + say + "</div>";
                //3. 把节点添加到页面上
                $(".container").append(divE);
                //4. 清空输入框的值
                $('#from').val("");
                $('#to').val("");
                $('#say').val("");
            }else{
                alert("输入不合法");
            }
        }
    });

    }

</script>
</body>

</html>
}
